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Auditory ossicle prosthesis
| Details |
Inventors: Heimke, Gunther; Plester, Dietrich; Jahnke, Klaus;
Assignee: Friedrichsfeld GmbH (Mannheim, DE)
Primary Examiner: Frinks; Ronald L.
Assistant Examiner:
Attorney, Agent or Firm: Fisher, Christen & Sabol
An auditory ossicle prosthesis comprises a grooved plate and a depending shaft integrally formed as a one-piece construction from a biologically inert ceramic material, provided with a hole extending through the plate and along the interior of the shaft to reduce the amount of material to be removed by grinding when the device is fitted to the patient. |
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DETAILED DESCRIPTION We claim: 1.
Auditory ossicle prosthesis comprising a rigid plate and a depending tubular shaft formed integrally as a one-piece construction from a biologically inert ceramic material, the surface of the plate on the side away from the shaft being provided with a plurality of grooves.
2.
Prosthesis according to claim 1, wherein the axis of the shaft is inclined at an angle of approximately 30.
degree.
with respect to the grooved surface of the plate, and the grooves are parallel with a plane passing through the axis of the shaft and normal to the plane of the gooved surface.
3.
Prosthesis according to either one of claims 1 or 2, wherein the cross-section of said shaft is uniform along its entire length.
4.
Prosthesis according to either one of claims 1 or 2, wherein said ceramic material comprises alumina ceramic having an Al.
sub.
2 O.
sub.
3 content of at least 99.
0 percent by weight.
5.
Prosthesis according to claim 3, wherein said ceramic material comprises alumina ceramic having an Al.
sub.
2 O.
sub.
3 content of at least 99.
0 percent by weight.
Description:
BACKGROUND OF THE INVENTION The present invention concerns a one-piece auditory ossicle prosthesis consisting of a plate and of a shaft attached to it.
Such prostheses are necessary for reconstructing the complete auditory ossicular chain and thus to improve hearing if the complete auditory ossicular chain is fully or partially destroyed by chronic inflammations of the middle ear or by other injuries.
Since there are, in general, no two identical cases in which a curative and hearing-improving operation on the middle ear (tympanoplasty) is necessary, it is necessary to have the possibility to adjust the needed implant to the actual individual conditions.
The implants used hitherto consist of different plastics, e.
g.
, silicones.
Implants made of porous plastics are also in use already.
They always consist of a round plate and a shaft attached centrally to one side of the plate, with the axis of the said shaft being perpendicular to the plane of the plate
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